How can I do to profile ruby Unit tests execution?

I'd like to know how much took to run the 10 most time consuming tests.. like I can do with rspec, any 开发者_如何学Csuggestion?

Short answer:

gem install minitest # Install MiniTest
gem install minitest_tu_shim # Install Test::Unit shim
use_minitest yes # Use MiniTest Test::Unit shim instead of stdlib Test::Unit 
ruby your_test.rb -v # Run your test in verbose mode

Ruby 1.9 use MiniTest as its default testing framework instead of Test::Unit. MiniTest is smaller, faster, has more useful features, and is largely backward compatible with Test::Unit. One of those newer features is measuring the time each test takes with the -v flag. When you run the e sure you place this flag after the script

If, as in rails, you use Rake::TestTask to run your tests, you'll can either specify it at runtime by running

rake test TESTOPTS='-v'

or specify it in the task by adding -v to the options attribute, like so

Rake::TestTask.new do |t|
  t.options = '-v'
end

Finally, if you're using rails and MiniTest just isn't good enough for you, you might appreciate the test_benchmark plugin. Usage is easy. Add the following line to your config/environments/test.rb

config.gem "timocratic-test_benchmark",
  :lib => 'test_benchmark',
  :source => 'http://gems.github.com'

Install it with

RAILS_ENV='test' rake gems:install

From then on, you'll get a nice sorted list when you run your tests

rake test:units
[...]
Test Benchmark Times: Suite Totals:
7.124 test_destroy(FeedTest)
7.219 test_create(FeedTest)
7.646 test_subscribe_to_auto_discovery(FeedTest)
9.339 test_auto_discover_updates_url(FeedTest)
9.543 test_find_or_create_by_auto_discover_url(FeedTest)
15.780 test_import_from_opml(FeedTest)

I'm sorry to say that MiniTest and the test_benchmark plugin are incompatible with each other, but I strongly encourage you to try MiniTest, since it'll make your tests faster, and will continue to be supported in Ruby 1.9.

Maybe run your unit tests under the ruby profiler by executing the code with ruby -rprofile instead of just ruby?

Minitest::Profile is a new gem that lists the top offenders after a standard test run.

https://github.com/nmeans/minitest-profile